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by dist-epoch 893 days ago
Hmm, I asked Bing Chat in Precise mode and got the correct answer:

Q: What is the result of subtracting 9999999999999998.0 from 9999999999999999.0

A: The result of subtracting 9999999999999998.0 from 9999999999999999.0 is 1.0. Here is the calculation: 9999999999999999.0−9999999999999998.0=1.0

I also tried a variation and it's still correct, maybe it's using a calculator plugin:

Q: What is the result of 1239995999999999.0 - 1239995999999998.0

A: The result of the subtraction operation 1239995999999999.0−1239995999999998.0 is 1.0